Fuse plug



June 24, 1930.

H. M. MUNCHERIAN 1,766,303

FUSE PLUG 2 Sheets-Sheet 1 Filed Sept. 15, 1928 Inventor y Artornqy June24, 71930.

H. M. MUNCHERIAN FUSE PLUG 2 Sheets-Sheet 2 Filed Sept. 13, 1928Inventor i2? ha fmcz'e7'zlzz Patented June 24, 1 930 I BRAND I. OI'ATLAN'IA, GEORGIA FUSE PLUG Application filed September 18, 1928. SerialNo. 805,736.

The present invention relates to fuse plugs adapted particularly forhouse cir-' cuits and has for its rincipal objectto provide a plug ofthis racter equipped with a multiplicity of fusible links adapted to besuccessively connected in the circuit and thus enable the circuit to beconstantly p maintained in closed condition upon the fusing. or blowingout of any of the links due to the overloading of the circuit andwithoutneces'sitating the removal of the plug from'its socket.

A" still further object of the. invention is to arrange the series offusible links concentrically within the plugs'and providing a pivotallymounted switch member 7 adapted for engagement with any one of saidlinks and providing means for releasing the switch member from thefusible links with which the same is in contact and after the same hasbecome fused so.

that the switch may be moved into contact with another of said links.

An additional object is. to provide a spring means for actuatin theswitch so as to automatically move t e same into contacting engagementwith a fresh link.

I A still further object is to provide a fuse plug of this character ofa simple and practical construction, which is eflicient and reliable inperformance, relatively inexpen si've to manufacture and install inoperative position and otherwise well adapted to the purpose for whichthe same is intended.

Other objects and advantages reside in ures 1 an re 1 :11 verticalsectional view Figure 4 is a transverse sectional view takensubstantially along a line 4-4 of Figure 1.

Referring now to the drawings in detail, I the invention comprises afuse plug of the character generally employed in house electric circuitsand composed of a cylindrical body member 5 of porcelain or otherinsulation material having a series of concentrically arrangedlongitudinally extending l0 compartments 6 formed therein with the lowerends of said compartments opening I outwardl through the bottom portionof the a body an the upper ends thereof communieating with a, chamber 7formed 'at the 65 center ofthe upper portion of the body.

. The central portion of the body is formed with a hub 8 from whichpartitions 9 extend radially therefrom for connection-with the outerwall of the body 5 and serves to form partitions between thelongitudinally extending compartment 6.

The upper portion of the hub 8 terminates inwardly of the upper edge ofthe outer wall 7 of the'bod 5 as clearly illustrated in Fig- .7

3 of the drawings. A central bore extends through the hub 8 throughwhich is inserted a metallic pin 10 having its opposite ends protrudinoutwardly from the opposite end of the hu To the under side of the body5 is fitted a cap 11, likewise constructed of insulation material andalso formed with a central opening through which the lower end of thepin 10 extends. A sleeve 12 is fitted about the pin 10 constructed ofconductor material and provided with a flange 13 at its .u per end andseated upon the upper edge 0 the hub 8 and with its lower end formedwith a relatively slight flange 14 adapted to seat 00 within a channeledgroove formed in the flanged head 15 at the lower end of the pin 10.

A positive connection is thus provided for the pin and the sleeve at thelower end 05 thereof. The flanged end 15 of the pin 10 extends outwardlbeyond the cap 11 and constitutes one o the contact members for the plugwhen thesame is inserted in an electric socket.

The other contact for the plug is rovided by the usual metallic threadeds eeve 16 fitted about the lower ortion of the bod 5 and by means ofwhic the plug is threa edly fitted in the electric socket.

The lower'end of the sleeve 16 is turned inwardly as indicated at 17between the cap 11 and the lower edge of the body as clearlyillustratedvin Figure 1 of the drawings.

fusible link 18 is arranged within each of the compartments 6 anddisposed vertically with their lower ends bent angularly between theinturned lower ends 17 of the threaded sleeve 16, said inturned end 17being provided with openings through which the lower ends of the linksmay be inserted.

Pivot pins 19 extend radially of the hub 8 of the body across each ofthe com artments 6 and through the upper portion 0 the links 18 withinsaid compartment. The links are thus normally retained in fixed positionwithin their respective compartments.

'A switch arm 20 is rotatably mounted on the upper portion of the pin 10and is seated upon t e upper flange 13 of the sleeve '12. The outer endof the switch 20 protrudes transversely of the upper portion of each ofthe compartments 6 and is adapted upon the rotation of the switch toengage the upper end of the fusible link 18.

It will thus be apparent that the switch 20 and links 18 serve tocomplete the circuit through the plug by reason of their enagement withthe respective contacts ormed by the pin 10 and sleeve 16. An

I insulated pin 21 extends vertically through the switch20 with itsupper end extendin above the switch and to which is attache one end of acoiled spring 22 having its op posite end attached to the upper end ofthe pin 10. v

' The in 10 is stationar within the hub ofthe lug and according y thetension of the spring is utilized to rotate the switch 20 about said in.By insulating one end of the spring rom the switch the current passingthrough the plug will not affect the spring so as to impair theresiliency of the same.

A mica cover plate 26 is placed upon the upper edges of the body 5 andsecured in position y a cap 23 within which is arranged a' series ofopenings 24 registering with the compartment 6 of the body so that thecondition of the links 18 may be in- 1 spected.

It will be readily apparent from the foregoing descripltion that shouldthe link 18 with which t e switch arm 20 is in contact, become fused,the broken upper endof the link will then be permitted to swing aboutthe horizontalpin 19 and permit the switch arm 20 to be moved intocontacting position with the adjacent fusible link 18.

The outer ends of the. pivot pin 19 are recessed in the walls of thebody5 and the recess is then filled with a plastic insulation compositionindicated at 25 to revent contact between the sleeve 16 an the end ofthe pin 19. The action of the plu for maintaini one of the unbroken liin the circuit 1s thus automatic.

It is obvious that my invention is susceptible to various changes andmodifications in construction without departing from the spirit of theinvention or the sco of the appended claims, and I accordingy claim allsuch forms of the device to who I am entitled. I

Havin thus described my invention, what I c aimas new is:

1. A fuse plug comprising a body having a plurality of concentricallyarra compartments formed therein, a fusible link disposed within each ofsaid compartments, a pivot pin extending through the upper portion ofeach of said links contact members for the plug, one of said contactmembers being arranged in contacting relation with one end of each ofsaid links, the opposite end of said links being arranged for pivotalmovement about its associated pivot pin upon the fusin of the link and aswitch arm connected W151 the other of said contacts and movable in aath for successive en agement with the plvoted end of said 1 2. A fuseplug comprising a body having a plurality of concentrically arrangedcompartments formed therein, a fusible link disposed longitudinally ineachof said compartments, a pair of contact members for the plu one ofsaid members being posed a out the outer walls of the plug with one endextended inwardly and connected with one endof each of said links, saidother contact member being centrally disposed within the plug, a switcharm rotatabl mounted at one end of said last name contact member andadapted for movement in a path for successive enfifiment with the otherend of said sprin arm in one direction and a pivot pin for each of saidlinks and extending through the end thereof adjacent said switcharm andadapted for pivotal movement upon the fusi of the link whereby toreleasethe switc arm and permit the movement tlaihnekreof for engagementwith an adjacent 3. Afuse plug comprising a body having aplurality ofconcentrically arr compartments, a fusible link 'pivotally disposed ineach compartment for movement about a horizontal axis, a contact memberhaving e agement with each of the said fusible li' a metallic pinextending centrally of the said body, a sleeve on said pin provided witha flange at its upper end, said dis:

means normally urging the switch a sleeve and pin constituting a contactfor the said body, a switch arm rotatably mounted on the upper portionof the pin and seated upon the said upper flange of the sleeve, saidswitch arm having its outer end extending over each of the saidcompartments and adapted upon the rotation of the switch to successivelyengage the fusible links, and a coil spring encircling the upper end ofthe said pin and attached thereto with its free end connected with theswitch arm for rotating the same about said pin.

In testimony whereof I aflix my signature.

H'RAND M. MUNCHERIAN.

